Several Factors Determine The Deck Post Size to Safely Support Your Deck

Deck post size is important. So build your deck the right way, from
the ground and posts up.

That means that once you have the footings in place you need to install
posts - which will support the beams - that in turn support the joists
– that support the decking – and eventually you, your family
and friends.

As you can see a lot is riding on the deck post size. But what size
of post is right for your deck?

The Deck Post Size Table below
will help you answer that question or learn more about loads
for posts.

Understand Loads First

If you haven't already read the article on load capacity, read it now and then continue on here.

The dimensions in the following table are based on
a total load of 50 psf for the particular species of wood. So it is
irrelevant if you are building a deck designed to withstand 70 psf.

In that case you would have to refer to the building
code or other engineering manuals usually found at your public library
to determine incremental differences.

From our example, take the largest load area of 28
sf and refer to the chart to determine the maximum dimensions of post
that you should use given the load area.

In other words, look at the wood species, post size
and load area and you will see the maximum height of post you can
safely use. In this example, 28 sf falls under the 36. If you chose
to use cedar post, its maximum height would be 10 ft.

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